APPLIED MATHEMATICS AND COMPUTATION, vol. 104, no. 1, page. 1 - 14, 1999-09-01
IMA JOURNAL OF APPLIED MATHEMATICS, vol. 62, no. 3, page. 227 - 244, 1999-06
APPLIED MATHEMATICS AND COMPUTATION, vol. 100, no. 2-3, page. 265 - 283, 1999-05